Two members of a Russian ultranationalist group allegedly involved in high-profile killings have been arrested in Serbia and Ukraine.

Russia's Investigative Committee spokesman said on May 13 that Ilya Gorycahev was arrested in Serbia, while Mikhail Volkov was detained in Ukraine.

The two activists, who belong to the "Militant Organization of Russian Nationalists" (BORN) were allegedly involved in the murders of a Moscow City Court judge, Eduard Chuvashov, in April 2010 and lawyer Stanislav Markelov in January 2009.

The two men have also been implicated in the killings of three antifascist activists and four Russian citizens from the Caucasus.

The pair have been accused of at least two attempted murders, the organization of an extremist group, and the illegal possession and distribution of weapons.